Rosemount™ 228
Toroidal Conductivity Sensors
Reference Manual
LIQ-MAN-228, Rev V
April 2018
Safety Information
WARNING!
HIGH PRESSURE AND TEMPERATURE HAZARD
Before removing the senosr, reduce the process pressure to 0 psig and cool down the process temperature.
Failure to reduce the pressure and temperature may cause serious injury to personnel.
CAUTION!
EQUIPMENT DAMAGE
The wetted sensor materials may not be compatible with process composition and operating conditions. Application compatibility is
entirely your responsibility.
Contents
Contents
Chapter 1 Description and specifications ..........................................................................................1
1.1 Description .................................................................................................................................... 1
1.2 Unpacking and inspection .............................................................................................................. 1
1.3 Sensor Specifications ......................................................................................................................1
1.4 Ordering information ..................................................................................................................... 4
Chapter 2 Install ...............................................................................................................................5
2.1 Installing the sensor ....................................................................................................................... 5
2.2 Insertion/Retraction Assembly Installation Requirements .............................................................. 8
2.2.1 Manual Retraction Assembly ............................................................................................9
2.2.2 Mechanical Retraction Assembly (PN 23311-00) ............................................................12
2.2.3 Replacing Seals in Manual and Mechanical Retraction Assemblies ................................. 15
Chapter 3 Wiring ........................................................................................................................... 19
3.1 Wiring the Sensor .........................................................................................................................19
Chapter 4 Calibration ..................................................................................................................... 23
4.1 Sensor calibration .........................................................................................................................23
4.2 Calibrating against a Standard Solution ........................................................................................23
4.3 Calibrating against a Referee - in-Process ..................................................................................... 25
4.4 Calibrating against a Referee - Grab Sample ................................................................................. 26
Chapter 5 Maintaining and Troubleshooting .................................................................................. 29
5.1 Maintaining the sensor .................................................................................................................29
5.2 Troubleshooting .......................................................................................................................... 29
Chapter 6 Accessories .................................................................................................................... 31
Chapter 7 Return of Materials .........................................................................................................33
Rosemount 228 Sensor i
Contents
ii Reference Manual
Description and specifications
1 Description and specifications
1.1 Description
The Rosemount 222 toroidal flow through conductivity sensor measures conductivity in
highly conductive liquids up to 2 S/cm (2,000,000 μS/cm). A noninvasive flow through
design allows for in-line installations without any obstruction to sample and makes these
sensors ideal for use with viscous or fibrous liquids.
1.2 Unpacking and inspection
Complete the following steps when you unpack your instrument.
1. Inspect the shipping container. If there is damage, contact the shipper immediately
for instructions.
2. If there is no apparent damage, and remove the sensor.
3. Ensure that all items shown on the packing list are present. If items are missing,
contact your local Customer Care representative.
4. Save the shipping container and packaging.
They can be reused to return the sensor to the factory in case of damage.
1.3 Sensor Specifications
Sensor specificationsTable 1-1:
Sensor specification Description
Wetted materials Body materials either glass-filled PEEK, glass-filled Tefzel,
or unfilled Tefzel. Option -20 has EPDM gasket
Process connection -20: 5/8 in. 11 UNC, -21: 3/4 in. MNPT
Cable length 20 ft (6.1 m)
Maximum cable length 200 ft (61.0 m)
Weight/shipping weight 2 lb / 3 lb (1.0 kg / 1.5 kg)
Maximum operating temperature and pressureTable 1-2:
Maximum pressure (for
Body material option Maximum temperature Maximum pressure
-02 (Glass-filled PEEK
(standard temperature))
248 °F (120 °C) 295 psig (2135 kPa) 220 psig (1618 kPa [abs])
CRN registration only)
Rosemount 228 Sensor 1
Description and specifications
Maximum operating temperature and pressure (continued)Table 1-2:
Maximum pressure (for
Body material option Maximum temperature Maximum pressure
-03 (Glass-filled PEEK (high
temperature))
-04 (Glass-filled Tefzel) 248 °F (120 °C) 200 psig (1480 kPa) 150 psig (1135 kPa [abs])
-05 (Unfilled Tefzel) 248 °F (120 °C) 200 psig (1480 kPa) 150 psig (1135 kPa [abs])
392 °F (200 °C) 295 psig (2135 kPa) 220 psig (1618 kPa [abs])
CRN registration only)
Insertion adapter specificationsTable 1-3:
Maximum
pressure
Adapter
part number
23242-02 For use with
23242-03 For use with
2001990 For use with
Sensor compatibility
option -21
option -20
option -21
Process connection
1-1/2 in.
MNPT
1-1/2 in.
MNPT
2 in. MNPT CPVC
Wetted materials
316 stainless
steel, glassfilled PEEK,
Viton
316 stainless
steel, glassfilled PEEK,
Viton
Viton
Maximum
temperature
392 ° F
(200 °C)
392 °F
(200 °C)
100 °F
(38 °C)
185 °F (85 °C)45 psig (412
Maximum
pressure
295 psig
(2135 kPa)
295 psig
(2135 kPa)
100 psig
(791 kPa
[abs])
kPa [abs])
(for CRN
registration
only)
220 psig
(1618 kPa
[abs])
220 psig
(1618 kPa
[abs])
N/A 1 lb / 2 lb
Weight /
shipping
weight
3 lb / 4 lb
(1.5 kg / 2.0
kg)
3 lb / 4 lb
(1.5 kg / 2.0
kg)
(0.5 kg / 1.0
kg)
Retraction assembly specficationsTable 1-4:
Specification Description
Sensor compatibility The retraction assemblies are used with 228 - [ ]-20-54-62
only
Wetted materials 315 stainless steel, ethylene polypropylene (EP), unfilled
Teflon, carbon-filled Teflon
Process connection 1 - 1/2 in. MNPT
Maximum operating condition 392 °F (200 °C), 295 psig (2135 kPa [abs])
2 Reference Manual
Description and specifications
Maximum retraction/insertion conditionsTable 1-5:
Description Temperature Pressure
23311-00, mechanical retraction assembly
23311-01, manual retraction assembly
392 °F (200 °C) 295 psig (2135 kPa
[abs])
266 °F (130 °C) 35 psig (343 kPa
[abs])
Ball valve specifications (sold separately)Table 1-6:
Specification Description
Part number 9340065
Wetted materials 316 stainless steel, Teflon TFE
Process connection 1-1/2 in. FNPT
Weight / shipping weight 4 lb / 5 lb (2.0 kg / 2.5 kg)
Ball valve pressure and temperature
Maximum insertion
travel
10.5 in. (267 mm) 12 lb / 15 lb (5.5 kg /
12.0 in. (305 mm) 9 lb / 12 lb (4.5 kg /
Weight / shipping
weight
7.0 kg)
5.5 kg)
Rosemount 228 Sensor 3
Description and specifications
1.4 Ordering information
Rosemount 228 Toroidal Conductivity Sensor Ordering InformationTable 1-7:
Model Sensor type
228 Toroidal Conductivity Sensor
Materials of construction
02 Glass-filled PEEK (standard temperature)
03 Glass-filled PEEK (high temperature)
04 Glass-filled Tefzel
05 Unfilled Tefzel
Process connection
20 5/8 in. 11 UNC
21 3/4 in. MNPT
Cable type
54 Unshielded cable
56 EMI/RFI shielded cable
(5)
(1)
(2)
(3)
(4)
(6)
(7)
Cable length
61 6.1 m (20 ft)
62 457 mm (18 in.)
(1) Not available with options -50-62 and -54-62.
(2) Not available with option -54-62.
(3) This option requires a mounting adapter. This option comes standard with an EPDM gasket (Viton® and
Kalrez® gaskets are also available).
(4) Not available with option -62.
(5) Cable may be extended using the remote junction box PN 23550-00 (sold separately) and extension cables..
(6) Recommended for use with transmitter models 1054 and 2054. May be used with transmitter models 1055,
1056, 1066, 54C, 54eC, 81T, 2081T, 3081T, 4081T, 5081, and XMT, but not recommended.
(7) Recommended for use with transmitter models 1055, 1056, 1066, 56, 54C, 54eC, 5081, and XMT.
(8) For use with option -54 only. Connects sensor used in valve insertion assembly to junction box. Requires
interconnecting cable to connect junction box to transmitter. Use either cable 23294-00 (unshielded) or
23294-05 (shielded).
(8)
4 Reference Manual
2 Install
2.1 Installing the sensor
Keep at least 1 in. (25 cm) between the sensor and the pipe wall. If clearance is too small,
calibrate the sensor in place. Ensure that the sensor is completely submerged in liquid.
Mounting the sensor in a vertical pipe run with the flow from bottom to top is best. If the
sensor must be mounted in a horizontal pipe run, orient the sensor in the 3 o-clock or 9
o'clock position.
Rosemount 228 dimensional drawingFigure 2-1:
Install
Rosemount 228 Sensor 5
Install
Figure 2-2:
Insertion adapter 23242-02 for use with 3/4 in. MNPT threaded process
connection (-21 option)
6 Reference Manual
Install
Figure 2-3:
Insertion adapter 23242-03 for use with 5/8 in. 11 UNC threaded process
connection (-20 option)
Rosemount 228 Sensor 7
Install
Figure 2-4:
Procedure
1.
2. Keep at least 1 in. (2.5 cm) between the sensor and pipe walls.
3. Mount the sensor in a vertical pipe run with flow from top to bottom.
Insertion adapter 2001990 for use with 3/4 in. MNPT threaded process
connection (-21 option)
Mount the sensor in the pipe.
If the clearance is too small, calibrate the sensor in place.
If the sensor must be mounted in a horizontal pipe run, orient the sensor in the
3 o'clock or 9 o'clock position.
4. Ensure that the sensor is completely submerged in liquid.
2.2 Insertion/Retraction Assembly Installation
Requirements
Insertion/Retraction Assembly Installation RequirementsTable 2-1:
Requirement Description
Process connection 1-1/2 in. Larger openings may keep the sensor
from inserting far enough into the process liquid.
Line size 3 in.; 2 in. line requires in-place calibration.
Valve 1-1/2 in. NPT full port valve (PN 9340065)
Retraction clearance 2 ft (0.6 m)
Excess vibration Provide mechanical support if excess vibration is
expected.
8 Reference Manual
Insertion/Retraction Assembly Installation Requirements (continued)Table 2-1:
Requirement Description
Flush water Provide 1/8 in. valves in inlet and outlet flush
2.2.1 Manual Retraction Assembly
Installing a Manual Retraction Assembly
1. Loosen the collet nut and retract the sensor tube into the retraction chamber.
See Figure 2-5.
Install
ports. Position flush ports so that the retraction
chamber can be drained.
Rosemount 228 Sensor 9
Install
Manual retraction assembly dimensional drawingFigure 2-5:
2. Loosen the union nut and separate the retraction chamber from the assembly.
Install the retraction chamber on the 1-1/2 in. NPT full port valve mounted on the
3.
process line or vessel.
4. Thread the sensor cable through the tube into the junction box. Screw the sensor
into the tube. Hand-tighten the sensor an additional half turn once the gasket is
seated.
5. Connect the sensor and interconnecting cable leads to the terminal strip in the
junction box.
See Figure 2-6.
10 Reference Manual
Install
Sensor-mounted junction box wiringFigure 2-6:
Note
The wiring diagram shown is for the cable PN 23294-00, which has three RTD (TC) leads. If you are
useing cable PN 23294-05, which has four RTD (TC) leads, connect the green, white, and clear
wires in the RTD bundle as shown in the drawing. Do not disconnect the black wire. When you
reconnect the RTD wires in PN 23294-05 to the transmitter, make the connections as described in
Step 6 (this section) or Step 3 (Installing the Mechanical Retraction Assembly.
6. Connect the other end of the cable to the transmitter. See the wiring diagrams in
Figure 3-2, Figure 3-3, and Figure 3-4. For cable PN 23294-00, follow the wiring for the
228-54 sensor. For cable PN 23294-05, follow the wiring for the 228-56 sensor with
the following exception:
Refer to the wire function diagram for the 228-56 option in Figure 3-1 and identify
the RTD wire bundle. Connect the RTD wires to the transmitter as follows:
• Green - RTD in
• Black - No connection
• Clear - RTD common or RTD return
• White - RTD sense
Wrap the bare end of the black wire to prevent accidental connections.
7.
Insert the sensor and tube assembly into the retraction chamber.
8. Tighten the union nut.
9. Open the ball valve, check for leaks, and manually insert the sensor into the process.
10. Position the sensor at least 1/2 in. (13 mm) away from any wall of the vessel or pipe.
11. Tighten the collet nut.
Rosemount 228 Sensor 11
Install
Retracting the Manual Retraction Assembly
Prerequisites
Make certain that the system pressure is less than 35 psig (342 kPa [abs]).
Procedure
1. Push in on the sensor using the top of the junction box. Slowly loosen the collet nut.
WARNING!
HIGH PRESSURE
Reduce pressure to 0 psig. Do not loosen collet nut until pressure is 0 psig.
Failure to reduce pressure may cause a loose collet nut to disengage and cause injury to
personnel.
2. When the collet nut is loose enough, slowly ease the sensor back so that it clears the
ball valve. Close the valve to the process line.
3. Drain the retraction chamber contents using the 1/8 in. flush ports.
4. Loosen the 3 in. hex union nut. Removt the sensor and tube assembly.
5. Replace the 3 in. hex nut O-ring. Place the sensor and tube assembly back in the
retraction assembly. Tighten the 3 in. hex union nut. Verify that the 1/8 in. flush
ports are closed.
NOTICE
With the ball valve closed and the retraction chamber 1/8 in. flush ports open, some
residual process fluid may leak from the 3 in. hex union nut female ACME threads. This
leakage is normal and to be expected.
WARNING!
HIGH PRESSURE
Retraction chamber contents may be under pressure. Before opening the ball valve,
make sure that the process pressure is less than 35 psig (342 kPa [abs]).
Failure to reduce pressure may cause a loose collet nut to disengage and cause injury to
personnel.
6. Open the ball valve and check for leaks. Insert the sensor into the process. Tighten
the collet nut.
2.2.2 Mechanical Retraction Assembly (PN 23311-00)
Installing the Mechanical Retraction Assembly
1.
Tighten the sensor cable through the tube into the junction box. Screw the sensor
into the tube. Hand-tighten the sensor an additional half turn once the gasket is
seated.
12 Reference Manual
See Figure 2-7.
Install
Mechanical retraction assemblyFigure 2-7:
2. Terminate the sensor wiring in the junction box.
See Figure 2-6 for wiring details.
3.
Connect the other end of the cable to the transmitter.
Rosemount 228 Sensor 13
Install
See the wiring diagrams in Figure 3-2, Figure 3-3, and Figure 3-4. For cable PN
23294-00, follow the wiring for the 228-54 sensor. For cable PN 23294-05, follow
the wiring for the 228-56 sensor with the following exception:
Refer to the wire function diagram for the 228-56 option in Figure 3-1 and identify
the RTD wire bundle. Connect the RTD wires to the transmitter as follows:
• Green - RTD in
• Black - no connection
• Clear - RTD common or RTD return
• White - RTD sense
Wrap the bare end of the black wire to prevent accidental connections.
4. Using a 1/2 in. (13 mm) socket wrench, retract the sensor into the retraction
chamber.
5. Install the assembly on the 1-1/2 in. NPT full port ball valve mounted in the process
line or vessel.
6. Tighten the union nut.
7. Open the ball valve and check for leaks.
8. Using a 1/2 in. (13 mm) socket wrench, inser the sensor into the process line or
vessel.
9. Position the sensor at least 1/2 in. (13 mm) away from any wall of the vessel or pipe.
Set the travel stop collar A net to the nut housing.
WARNING!
HIGH PRESSURE
Do not loosen cap screws or collar when pressurized.
Failure to reduce pressure may cause a loose part to disengage and cause injury to
personnel.
Retracting a Mechanical Retraction Assembly
Prerequisites
Make sure that the system pressure is less than 295 psig (2135 kPa [abs]) before retracting
the sensor.
Procedure
1.
Retract the sensor using a 1/2 in. (13 mm) socket wrench. When the sensor clears
the ball valve, close the valve.
WARNING!
HIGH PRESSURE
Retraction chamber contents may be under pressure.
Failure to reduce pressure may cause a loose part to disengage and cause injury to
personnel.
14 Reference Manual
2. Drain the retraction chamber using 1/8 in. flush ports.
3. Loosen the 3 in. hex union nut and remove the retraction stop collar and orange
clamp top. Remove the sensor and tube assembly.
4. Replace the 3 in. hex nut O-ring. Place the sensor and tube assembly back in the
retraction assembly. Replace the retraction stop collar about 1/2 in. in front of the
clamp. Tighten the clamp screws, retraction stop collar, and 3 in. hex union nut.
Verify that the 1/8 in. flush ports are closed.
NOTICE
With the ball valve fully closed and the retraciton chamber 1/8 in. flush ports open,
some residual process fluid maay leak from the 3 in. hex union female ACME threads.
This leakage is normal and to be expected.
5. Before opening the ball valve, make sure that the process pressure is less than 295
psig (3135 kPa [abs]). Open the valve, check for leaks, and insert the sensor into the
process.
2.2.3 Replacing Seals in Manual and Mechanical Retraction
Install
Assemblies
1. Retract the sensor into the retraction chamber and fully close the ball valve.
2. Drain the retraction chamber contents using the 1/8 in. flush ports.
WARNING!
HIGH PRESSURE
Retraction chamber contents may be under pressure. Reduce pressure to 0 psig before
opening the retraction chamber.
Failure to reduce pressure may cause a loose part to disengage and cause injury to
personnel.
3. For mechanical retraction assemblies, mark the location of the nut housing cap and
retraction collar on the sensor tube. Remove both socket head cup screws from the
nut housing and loosent the retraction stop collar.
4. Remove the 3 in. hex union nut.
5. Withdraw the sensor from the retraction chamber.
6. Open the junction box and disconnect the sensor wires from the terminal block.
7. Remove the compression fitting just below the junction box and remove the
junction box from the sensor tube.
8. For manual retraction assemblies, pull down the nut guard and remove the collet
nut from the bushing housing.
9. Slide all hardware, including the bushing housing, off the sensor tube.
10. Remove the retaining ring from the bottom of the bushing housing.
11. Remove the Teflon guard.
Rosemount 228 Sensor 15
Install
12. From the top of the bushing housing, press out the Teflon bushing.
This will also push out the Teflon cup seal.
13. Replace all damaged parts with replacement parts from Figure 2-8 or Figure 2-9.
Replace the sensor tube if the surface is damaged.
A rough or uneven surface will prevent the Teflon cup from sealing.
Mechanical retraction assembly replacement partsFigure 2-8:
16 Reference Manual
Install
Manual retraction assembly replacement partsFigure 2-9:
14. Rebuild the bushing housing.
The open end of the cup seal (spring visible) faces the process.
15.
Carefully slide the bushing housing onto the sensor tube.
Do not damage the Teflon bushing or the Teflon cup seal.
16. For manual retraction assemblies, slide the 3 in. hex union nut, collet nut with nut
guard, junction box compression nut, and plastic ferrules onto the sensor tubee.
17. For mechanical retraction assemblies, slide the 3 in. hex union nut, retraction stop
collar, junction box compression nut, and plastic ferrules onto the sensor tube.
18. Connect the junction box to the sensor tube and wire the sensor leads to the
appropriate terminals.
Rosemount 228 Sensor 17
Install
19. For mechanical retraction assemblies, lock the retraction stop collar into position.
See Figure 2-8 or previously marked position for proper location.
20. Place the union nut O-ring at the bottom of the bushing housing. Insert the sensor
assembly into the retraction chamber and tighten the 3 in. hex union nut.
21. For mechanical retraction assemblies, install the nut housing cap.
See Figure 2-8 or previously marked position for proper location.
18 Reference Manual
3 Wiring
3.1 Wiring the Sensor
Keep sensor wiring away from ac conductors and high current demanding equipment. Do
not cut the cable.
NOTICE
For additional wiring information on this product, please refer to the
Liquid Transmitter Wiring Diagrams.
Wire functionsFigure 3-1:
Wiring
Rosemount 228 Sensor 19
Wiring
Wiring diagram for Rosemount 1056 and 56 TransmittersFigure 3-2:
20 Reference Manual
Wiring
Wiring diagram for Rosemount 1066 TransmittersFigure 3-3:
Wiring diagram for Rosemount 5081 TransmittersFigure 3-4:
Rosemount 228 Sensor 21
Wiring
Wiring sensors through a remote junction boxFigure 3-5:
Wire sensors point to point. For wiring at the transmitter end, refer to the appropriate transmitter wiring
diagram. For interconnecting cable 23294-00, use the 228-54 wiring diagram. For interconnecting cable
23294-04 and 23294-05, use the 228-54 wiring diagram.
Remote Junction Box (PN 23550-00) dimensionsFigure 3-6:
22 Reference Manual
4 Calibration
4.1 Sensor calibration
The nominal cell constant of the Rosemount 228 sensor is 2.7/cm. The error in cell
constant is about ±10%, so conductivity readings made the using the nominal cell constant
will have an error of at least ±10%. Wall effects,as shown in Figure 4-1, will likely make the
error greater.
For more detailed information on calibration methods, please reference application data
sheet ADS-43-025 available on the Emerson Liquid Analysis website.
Calibration
Figure 4-1:
Measured Conductivity as a Function of Clearance between Sensor and
Walls
4.2 Calibrating against a Standard Solution
Calibration against a standard solution requires removing the sensor from process piping.
This calibration method is practical only if wall effects are absent or if the sensor can be
calibrated in a container identical to the process piping. Ideally, the conductivity of the
standard used should be close to the middle of the range that the sensor will be used in.
Generally, toroidal conductivity sensors have good linearity, and so standards greater than
5000 µS/cm at 77 °F (25 °C) may also be used.
1.
Remove the sensor from the pipe.
2. Fill a container with the standard solution.
Rosemount 228 Sensor 23
Calibration
If wall effects are absent in the process installation, use a sufficiently large container
for calibration to ensure that wall effects are absent. To check for wall effects, fill the
container with solution and place the sensor in the center, submerged at least 3/4 of
the way up the stem. Note the reading. Then move the sensor small distances from
the center and note the reading in each position. The readings should not change.
If wall effects are present, be sure the vessel used for calibration has exactly the
same dimensions as the process piping. Also ensure that the orientation of the
sensor with respect to the piping is exactly the same in the process and calibration
vessels. See Figure 4-2.
Calibration installation orientationFigure 4-2:
3. Rinse the sensor with water.
4.
Immerse the rinsed sensor in the standard solution.
Use a good quality calibrated thermometer to measure the temperature of the
standard solution. The thermometer error should be less than ±1 °C. Allow adequate
time for the solution and sensor to reach thermal equilibrium. If the sensor is being
calibrated in an open beaker, keep the thermometer far enough away from the
sensor so it does not introduce wall effects. If the sensor is being calibrated in a pipe
tee or similar vessel, it is impractical to place the thermometer in the standard
solution. Instead, put the thermometer in a beaker of water placed next to the
callibration vessel. Let both come to thermal equilibrium with the ambient air before
continuing calibration. See Figure 4-3.
24 Reference Manual
Calibration
Measuring standard temperatureFigure 4-3:
Be sure air bubbles are not adhering to the sensor. An air bubble trapped in the
toroid opening has a particularly severe effect on the reading.
5.
Turn off automatic temperature compensation in the transmitter.
This eliminates error in the cell constant.
6. Adjust the transmitter reading to match the conductivity of the standard.
4.3 Calibrating against a Referee - in-Process
Prerequisites
If possible, adjust the conductivity of the process liquid so that it is near the midpoint of
the operating range. If this is not possible, adjust the conductivity so that it is at least 5000
µS/cm.
Turn off automatic temperature compensation in the transmitter. This eliminates error in
the cell constant.
Procedure
Connect the process and referee sensors in a series.
1.
Keep tubing runs between the sensors short and adjust the sample flow to as high a
rate as possible. Short tubing runs and high flow ensure that the temperature of the
liquid does not change as it flows from one sensor to another.
2. Allow the process liquid to flow through both sensors.
Orient the referee sensor so that the air bubbles always have an easy escape path
and cannot get trapped. Tap and hold the flow cell in different positions to allow
bubbles to escape.
Wait for readings to stabilize before starting the calibration.
Rosemount 228 Sensor 25
Calibration
3. Adjust the process sensor to match the conductivity measured by the referee
instrument.
Figure 4-4 shows the arrangement.
Calibration with a referee instrument exampleFigure 4-4:
4.4 Calibrating against a Referee - Grab Sample
This method is useful when calibration against a standard is impractical or when in-process
calibration is not feasible, because the sample is hot, corrosive, or dirty, making handling
the waste stream from the referee sensor difficult.
1.
Take a sample of the process liquid.
Take the sample from a point as close to the process sensor as possible. Be sure the
sample is representative of what the sensor is measuring. If possible, adjust the
conductivity of the process liquid so that it is near the midpoint of the operating
range. If that is not possible, adjust the conductivity so that it is at least 5000 µS/cm.
2. Connect the process and referee sensors.
26 Reference Manual
Calibration
Keep temperature compensation with the transmitter turned on. Confirm that the
temperature measurements in both process and referee instruments are accurate,
ideally to within ±0.5 °C.
3. Place the sensors in the grab sample.
Wait until the readings are stable before starting the calibration.
4. Adjust the reading from the process analyzer to match the conductivity measured
by the referee sensor.
Rosemount 228 Sensor 27
Calibration
28 Reference Manual
Maintaining and Troubleshooting
5 Maintaining and Troubleshooting
5.1 Maintaining the sensor
WARNING!
HIGH PRESSURE
Retraction chamber contents may be under pressure. Reduce the pressure to 0 psig before
opening the retraction chamber.
Failure to reduce pressure may cause a loose part to disengage and cause injury to personnel.
WARNING!
TOXIC LIQUIDS
Be sure the sensor has been cleaned of process liquid before handling.
Generally, the only maintenance required is to keep the opening of the sensor clear of
deposits. Cleaning frequency is best determined by experience.
5.2 Troubleshooting
Resistance vs. Temperature for Temperature Compensation (PT-100 RTD)Table 5-1:
Temperature Resistance
10 °C (50 °F) 103.9 Ω
20 °C (68 °F) 107.8 Ω
25 °C (77 °F) 109.7 Ω
30 °C (86 °F) 111.7 Ω
40 °C (104 °F) 115.5 Ω
50 °C (122 °F) 119.4 Ω
Rosemount 228 Sensor 29
Maintaining and Troubleshooting
30 Reference Manual
6 Accessories
Part number Description
23550-00 Remote junction box
23294-00 Interconnecting extension cable, unshielded, prepped (for use with re-
mote junction box)
23294-05 Interconnecting extension cable, shielded, prepped (for use with remote
junction box)
23311-00 Mechanical valve insertion assembly
23311-01 Manual valve insertion assembly
2001990 Mounting adapter, 2 in. MNPT, CPVC
9550179 O-ring, EP rubber, for 20011990
23242-02 Mounting adapter, 1-1/2-in. MNPT insertion, 1-in. FNPT conduit connec-
tion, PEEK
33081-00-99SQ7091AAdapter insert, Tefzel, for 23242-02
Accessories
33081-00 Adapter insert, PEEK, for 23242-02
23242-03 Mounting adapter, 1-1/2-in. MNPT insertion, 3/4-in. FNPT conduit connec-
tion, PEEK
33080-01-99SQ7091BAdapter insert, Tefzel, for 23242-03
23277-01 Mounting adapter, Foxboro, PEEK, 5/8 11 UNC
23277-01-99SQ7182 Mounting adapter, Foxboro, Tefzel, 5/8 11 UNC
33075-00 Viton gasket for option 20
33075-03 Kalrez gasket for option 20
9200276 Interconnecting extension cable, shielded, unprepped
9340065 1-1/2 in. FNPT full port ball valve for use with retraction assemblies
Rosemount 228 Sensor 31
Accessories
32 Reference Manual
7 Return of Materials
For repair and warranty inquiries, please contact Rosemount Customer Care to obtain a
Return Material Authorization (RMA) number. Drain the sensor of fluids before shipping it
back to Rosemount.
Return of Materials
Rosemount 228 Sensor 33
Return of Materials
34 Reference Manual
Return of Materials
Rosemount 228 Sensor 35
Return of Materials
36 Reference Manual
Return of Materials
Rosemount 228 Sensor 37
GLOBAL HEADQUARTERS
Emerson Automation Solutions
6021 Innovation Blvd
Shakopee, MN 55379, USA
+1 800 999 9307 or +1 952 906 8888
F +1 952 949 7001
liquid.csc@emerson.com
NORTH AMERICA
Emerson Automation Solutions
8200 Market Blvd
Chanhassen, MN 55317
Toll Free +1 800 999 9307
F +1 952 949 7001
liquid.csc@emerson.com
LIQ-MAN-228
Rev V
2018
EUROPE
Emerson Automation Solutions
Neuhofstrasse 19a P.O. Box 1046
CH-6340 Baar
Switzerland
T + 41 (0) 41 768 6111
F + 41 (0) 41 768 6300
liquid.csc@emerson.com
Linkedin.com/company/Emerson-Automation-Solutions
twitter.com/rosemount_news
Facebook.com/Rosemount
youtube.com/RosemountMeasurement
google.com/+RosemountMeasurement
AnalyticExpert.com
MIDDLE EAST AND AFRICA
Emerson Automation Solutions
Emerson FZE
Jebel Ali Free Zone
Dubai, United Arab Emirates, P.O. Box 17033
T +971 4 811 8100
F +971 4 886 5465
liquid.csc@emerson.com
©
2018 Emerson. All rights reserved.
The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a
mark of one of the Emerson family of companies. All other marks are the property of their
respective owners.
ASIA-PACIFIC
Emerson Automation Solutions
1 Pandan Crescent
Singapore 128461
Singapore
T +65 777 8211
F +65 777 0947
liquid.csc@emerson.com
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